It is amazing how love flow in your family. You all look happy and gorgeous. My family is just same as yours because we believe in united we stand, divided we fall. Having a big surprise for your sis would sweep her iff her feet. Carrying each other along in a family brings growth and promotes unity. Everyone grows together and no one is envy if another. Your gift to them won't be a bad idea. It will remind of life spent together. Success to you!